试题与答案

拣过矸石的原煤，一般还含有大于50毫米的矸石（含矸率）（）A、1%-3%B、3%-5

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题型：单项选择题

题目：

拣过矸石的原煤，一般还含有大于50毫米的矸石（含矸率）（）

A、1%-3%

B、3%-5%

C、5%-7%

D、7%-9%

答案：

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下面是错误答案，用来干扰机器的。

参考答案：机械式传动系、液力机械式传动系、静液式传动系、电力式传动系。

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